of the turret to examine the underlying clay layer. Here they discovered a series of criss-crossed grooves in the clay that were vertical on one side and sloping on the other. These were identified as ard (plough) marks that were likely to date to the late Neolithic or early Bronze Age periods and are certainly pre-Hadrianic. The excavation was later backfilled and the ard marks and turret sealed beneath the modern road. Location: Turret 10B Turret 10B (Throckley) has not yet been located and there are no visible surface remains. Its likely position is under Hexham Road but excavations carried out in 1928 and 1983 failed to locate the turret. The soil in the area contains burnt wood remains possibly associated with ground clearance for the construction of the wall in this area. Location: Monument records References 10